A study of symmetric and repetitive structures in image based modeling

A Study of Symmetric and Repetitive Structures in Image-Based Modeling Jiang Nianjuan Department of Electronical and Computer Engineering National University of Singapore A thesis submitted for the degree of Doctor of Philosophy 2012 July Declaration I hereby declare that this thesis is my original work and it has been written by me in its entirety. I have duly acknowledged all the sources of information which have been used in the thesis. This thesis has also not been submitted for any degree in any university previously. Signature: Date: Acknowledgements I would like to offer my sincerest gratitude to all the people who have helped to make this thesis possible. First of all, I would like to thank Dr. Tan Ping. Most of the work in this thesis was done under close supervision from him. Dr. Tan Ping is a very hard-working and intelligent person. He offered me great help on various problems and difficulties I encountered in my research. I am always inspired by his many bizarre and brave research ideas. It is a great pleasure working with him. Besides research and work, Dr. Tan Ping is also an easy-going and passionate friend in life. The many BBQ outings and conference trips are charitable memories in my PhD life. I would like to thank Prof. Cheong Loong-Fah. Ever since my undergraduate study in National University of Singapore he has been offering me guidance on computer vision study and research. Prof. Cheong is very knowledgeable and passionate about computer vision research. Under the guidance and supervision of him, I had large freedom on topics I wanted to study and explore. I have received valuable suggestions from him on my thesis writing. I am always grateful to his encouragement for me on pursuing a PhD degree. In the past five years I have been aided in maintaining the PC hardwares and softwares by Mr. Francis Hoon, a responsible and patient technologist who kept all the lab equipment and facilities in order. I would like to thank my fellow PhD students and lab colleagues. i They offered help in one way or another on my study and research work. Their cheerful presence made my life as a PhD student so much interesting and enjoyable. Specifically, I would like to thank the following people for assisting in several research experiments. Dr. Gao Zhi helped in the edge detection and segmentation on image patch for my single image modeling project. Mr. Han Shuchu assisted in point cloud alignment and mesh modeling in demonstrating potential applications of symmetry detection project. Mr. Pang Cong helped with early experiments in unambiguous 3D reconstruction project. I would like to thank the department of Electrical and Computer Engineering for offering me the opportunity and scholarship for my PhD study. Without the financial assistance I would not even start my PhD study. Beyond research (which sometimes seemed disencouraging and demoralizing) Li Qian had been a companionable housemate for four years. Her cheerful personality always made my home-hour relaxing and fun. I am so happy to have a greate friend like her. Gao Rui has been a great friend ever since I got acquaintance with her. It is a pleasure to have her and her two lovely cats (for not hunting my hamsters and fishes) as my housemates for the past one year. Finally, I would like to thank my husband, Yunzhen, and my parents for their unconditional understanding and support. It would not have been possible for me to complete my PhD study without their encouragement and love. ii Contents List of Tables vii List of Figures ix List of Symbols xiii Introduction 1.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Thesis overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . Principles of 3D Reconstruction 2.1 2.2 Camera Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.1.1 Camera Model . . . . . . . . . . . . . . . . . . . . . . . . 11 2.1.2 Calibration from Homography . . . . . . . . . . . . . . . . 15 2.1.3 Calibration from Vanishing Points and Lines . . . . . . . . 16 2.1.4 Calibration from Geometric Primitives . . . . . . . . . . . 17 3D Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.2.1 Two-View 3D Reconstruction . . . . . . . . . . . . . . . . 19 2.2.2 Multi-View 3D Reconstruction . . . . . . . . . . . . . . . . 20 Unambiguous Multi-view 3D Reconstruction 3.1 3.2 11 27 SfM from Unordered Image Collection . . . . . . . . . . . . . . . 27 3.1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.1.2 Related Works . . . . . . . . . . . . . . . . . . . . . . . . 30 Quantitative Reconstruction Evaluation . . . . . . . . . . . . . . . 32 3.2.1 32 Objective function . . . . . . . . . . . . . . . . . . . . . . iii 3.3 3.4 3.2.2 Visibility test . . . . . . . . . . . . . . . . . . . . . . . . . 35 3.2.3 Objective Function Validation . . . . . . . . . . . . . . . . 36 Efficient Optimization . . . . . . . . . . . . . . . . . . . . . . . . 37 3.3.1 3D Reconstruction Caching . . . . . . . . . . . . . . . . . 39 3.3.2 Incremental Spanning Tree Search . . . . . . . . . . . . . . 42 3.3.3 Fast Objective Function Evaluation . . . . . . . . . . . . . 43 3.3.4 Iterative search algorithm . . . . . . . . . . . . . . . . . . 45 Experiments and Discussion . . . . . . . . . . . . . . . . . . . . . 46 3.4.1 Experiments . . . . . . . . . . . . . . . . . . . . . . . . . . 46 3.4.2 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Joint Repetitive Structure Detection 4.1 53 Symmetry Detection . . . . . . . . . . . . . . . . . . . . . . . . . 53 4.1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 4.1.2 Related Works . . . . . . . . . . . . . . . . . . . . . . . . 56 Joint Repetitive Structure Detection - the Algorithm . . . . . . . 58 4.2.1 Algorithm Overview . . . . . . . . . . . . . . . . . . . . . 58 4.2.2 Repetitive Points Identification . . . . . . . . . . . . . . . 59 4.2.3 Structure Estimation . . . . . . . . . . . . . . . . . . . . . 60 4.2.4 Translational Lattice Detection . . . . . . . . . . . . . . . 62 4.2.5 Local Reflection Detection . . . . . . . . . . . . . . . . . . 67 4.3 Point Clouds Consolidation . . . . . . . . . . . . . . . . . . . . . 68 4.4 Experiments and Discussion . . . . . . . . . . . . . . . . . . . . . 68 4.4.1 Experiments . . . . . . . . . . . . . . . . . . . . . . . . . . 68 4.4.2 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 4.2 Symmetry Assisted Architecture Modeling 5.1 5.2 5.3 77 Architecture Modeling . . . . . . . . . . . . . . . . . . . . . . . . 77 5.1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 5.1.2 Related Work . . . . . . . . . . . . . . . . . . . . . . . . . 81 3D Reconstruction by Symmetry . . . . . . . . . . . . . . . . . . 85 5.2.1 Symmetry based Camera Calibration . . . . . . . . . . . . 85 5.2.2 Symmetry-based Stereo . . . . . . . . . . . . . . . . . . . . 90 Surface Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 iv 5.3.1 5.3.2 5.4 Geometry modeling . . . . . . . . . . . . . . . . . . . . . . Texture Enhancement . . . . . . . . . . . . . . . . . . . . 93 98 Experiments and Discussion . . . . . . . . . . . . . . . . . . . . . 100 5.4.1 Experiments . . . . . . . . . . . . . . . . . . . . . . . . . . 100 5.4.2 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 Conclusion 109 Appendix A Proof of Global Minimum 115 Appendix B Lattice Detection Comparison 117 Appendix C Symmetry-based Stereo 133 Appendix D Modeling Interface 135 Bibliography 149 v Abstract Creating photorealistic 3D digital models from street-view imagery has many important applications and involves fundamental vision problems. We investigated the paradox of having similar or repetitive structure in the input image data. In general, prior knowledge of structure regularity helps with the efficiency and quality of image-based-modeling; however, spurious camera geometries due to appearance ambiguity arising from similar structure can lead to algorithm failure in structure-from-motion, especially for unordered image collections. In this dissertation, we made a detailed survey on 3D reconstruction methodologies and proposed a novel objective function based on ‘missing correspondences’ to evaluate the optimality of a 3D reconstruction. An efficient algorithm is designed for optimization. We also investigated the problem on automatic detection of repetitive structures in the recovered scene and proposed a method to jointly analyze images and 3D point clouds to symmetric lattices. Finally, symmetry is further exploited for a novel camera calibration method and an interactive 3D modeling system working with a single input image. vi List of Tables 50 3.1 Comparison of runtime efficiency . . . . . . . . . . . . . . . . . . 5.1 Modeling statistics . . . . . . . . . . . . . . . . . . . . . . . . . . 107 B.1 Comparison on data . . . . . . . . . . . . . . . . . . . . . . . . 118 B.2 Comparison on data . . . . . . . . . . . . . . . . . . . . . . . . 118 B.3 Comparison on data . . . . . . . . . . . . . . . . . . . . . . . . 119 B.4 Comparison on data . . . . . . . . . . . . . . . . . . . . . . . . 120 B.5 Comparison on data . . . . . . . . . . . . . . . . . . . . . . . . 120 B.6 Comparison on data . . . . . . . . . . . . . . . . . . . . . . . . 121 B.7 Comparison on data (cont.) . . . . . . . . . . . . . . . . . . . . 122 B.8 Comparison on data (cont.) . . . . . . . . . . . . . . . . . . . . 123 B.9 Comparison on data (cont.) . . . . . . . . . . . . . . . . . . . . 124 B.10 Comparison on data (cont.) . . . . . . . . . . . . . . . . . . . . 125 B.11 Comparison on data . . . . . . . . . . . . . . . . . . . . . . . . 126 B.12 Comparison on data . . . . . . . . . . . . . . . . . . . . . . . . 127 B.13 Comparison on data 13 . . . . . . . . . . . . . . . . . . . . . . . . 127 B.14 Comparison on data . . . . . . . . . . . . . . . . . . . . . . . . 128 B.15 Comparison on data 15 . . . . . . . . . . . . . . . . . . . . . . . . 128 B.16 Comparison on data 10 . . . . . . . . . . . . . . . . . . . . . . . . 129 B.17 Comparison on data 11 . . . . . . . . . . . . . . . . . . . . . . . . 130 B.18 Comparison on data 12 . . . . . . . . . . . . . . . . . . . . . . . . 130 B.19 Comparison on data 14 . . . . . . . . . . . . . . . . . . . . . . . . 131 vii (a) (b) Figure D.11: (a) Auxiliary planes computed from frustum parameters. (b) User adjusted auxiliary planes for this particular building. 145 (a) (b) (c) (d) Figure D.12: (a) User strokes for creating the reference floor. (b) Floor model and reconstructed 3D points from stereo matching. (c) User strokes for floor duplication. (d) Multiple floor models obtained by translating and resizing the reference floor according to the user strokes in (c). 146 (a) (b) (c) (d) Figure D.13: (a), (b) and (c) are user strokes for creating the roof model in (d). 147 (a) (b) (c) (d) Figure D.14: (a) User strokes for creating pavilion model in Figure 5.1. (b) User strokes for creating pagoda model in Figure 5.11. (c) User strokes for creating pagoda model in Figure 5.12. (d) User strokes for creating pavilion model in Figure 5.2. representitive 3D architecture models reported in Chapter 5. 148 Bibliography [1] S. Agarwal, N. Snavely, I. Simon, S. M. Seitz, and R. Szeliski. Building rome in a day. In Proc. ICCV, 2009. 25, 111 [2] P. J. Besl and N. D. McKay. 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Figure 2.3: Parameterization of a parallelepiped 2li are edge lengths, and θij are the angles between non-parallel edges Given an image of a parallelepiped, the intrinsic characteristics of the camera and those of the parallelepiped give constraints on the parameter sets of both entities(93) Camera projection matrix P has 11 degrees of freedom and therefore five image points and an image direction are sufficient... is located at z = f The line from the camera center and perpendicular to the image plane is called the principal axis or principal ray of the camera The intersection of principal axis and the image plane is called the principal point Mathematically, a 3D point can be represented by a homogeneous 4-vector (X, Y, Z, 1)T , and a 2D image point can be represented by a homogeneous 3- 11 Figure 2.1: Pinhole... pinhole camera assumes that the image coordinates are Euclidean coordinates having equal scales in both axial directions In the case of CCD cameras, it is possible to have non-square pixels The non-equal scale factors in each direction can be modeled by representing the focal length of the camera in terms of pixel dimensions in the x and y dimensions respectively Thus, the camera calibration matrix of a CCD... to a new criteria for evaluating the optimality of a 3D reconstruction, and a novel algorithm for solving the ambiguity in image association and ordering problem We 8 study the behaviour of the new algorithm both theoretically and empirically The point clouds obtained from 3D reconstruction are usually sparse and noisy as compared to 3D scanner data Geometric constraints such as planarity, orthogonality,... as the same as the principal point 2.1.2 Calibration from Homography Homography is the mapping between different planes Mathematically, planar point coordinates are transformed by a 3 × 3 matrix H as x′ = Hx (2.9) The matrix H can be written as K[r1 r2 t], where r1 and r2 are the first two columns of R matrix between the coordinate frame of the plane and the coordinate frame of the camera A closed form... in nite line is imaged as a line terminating in a vanishing point The vanishing point v of the normal direction to a plane is related to the plane vanishing line as l = ωv Hence we can also write lT ω ∗ l2 = 0, 1 (2.12) where ω ∗ = ω −1 is called the dual image of the absolute conic (the DIAC) In general, five pairs of perpendicular lines are needed to solve for the entries of ω However, for most cameras... depth information can be recovered from the distribution of apparent velocities of movement of brightness patterns in an image, called optical flow in monocular vision system (e.g a single 2 Figure 1.1: Images are added and processed in a sequential manner in incremental 3D reconstruction moving camera) (34) With the development of 2D feature trackers such as (29), feature based structure and motion analysis... projection, and exploit such constraints for 3D reconstruction and modeling from a single 9 image The technical details are described in Chapter 5 Last but not least, we conclude and discuss limitations of the study presented in this dissertation and issues to be addressed in future research in Chapter 6 10 Chapter 2 Principles of 3D Reconstruction 2.1 2.1.1 Camera Calibration Camera Model Pinhole camera model... purpose of detecting symmetry and regular structure for image- based 3D modeling, all the existing methods face a fundamental difficulty In the case of 2D symmetry analysis, the presence of perspective distortion makes the image texture asymmetric A ne invariant features can help with the distortion but fails when there is occlusion, and the repetitive elements appear different in only a single image (Figure... image point by x, and the camera projection matrix by P Then Equation (2.1) can be rewritten compactly as x = PX, (2.3) P = K[R t] = K[R − RC], (2.4) where and we will use this expression throughout the thesis The parameters contained in K are called the intrinsic camera parameters and the six degrees of freedom contained in R and C are called the extrinsic camera parameters CCD cameras The ideal pinhole . A Study of Symmetric and Repetitive Structures in Image- Based Modeling Jiang Nianjuan Department of Electronical and Computer Enginee ring National University of Singapore A thesis submitted. systems are based on incremen- tal approaches, whereby images are added and processed in a sequential manner Figure 1.1. The image association problem, which is inevitab l e and error p r o n e in. world, and they are used for all kinds of 3D graphics and rendering applications. In computer graphics, software such as Maya or Google SketchUp are used to create models interactively, images are